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Abstract

Advances in wireless communication technology and the proliferation of mobile devices enable the capabilities of communicating with each other even in areas with no pre-existing communication infrastructure. Traffic and mobility models play an important role in evaluating the performance of these communication networks. Despite criticism and assumption from various researches on Transmission Control Protocols (TCP), weaknesses on Mobile Ad Hoc Network (MANET), and Vehicular Ad Hoc Network (VANET). A simulation was carried out to evaluate the performance of Constant Bit Rate, Variable Bit Rate and Transmission Control Protocol on MANET and VANET using DSR routing protocol. CBR, VBR, and TCP have different manufacturer operation mechanisms and these differences lead to significant performance of CBR and VBR over TCP with better throughput and less average maximal end-to-end delay. DSR was able to respond to link failure at low mobility which led to TCP’s performance in packets delivery.

Dynamic Source Routing Protocol

Dynamic Source Routing (DSR) is a simple and efficient routing protocol designed specifically for use in multi-hop wireless ad hoc networks of mobile nodes which operate entirely on demand, and works on two mechanisms i.e. route discovery and route maintenance. The route discovery is initiated if and only if the routes to destinations are not known, for which it initiates a route discovery by sending a route request (RREQ) to all its neighbouring nodes containing the IP address of both sender and receiver in the packet header allowing the routing packet overhead of DSR to scale automatically to only what is needed to react to changes in the routes currently in use (Broach et al., 1998). Performance evaluation conducted on both proactive and on demand protocols by Qasim et al. (2009), Kumar et al. (2008), and Raju and Mungara (2010) showed that DSR performed better than AODV and other proactive protocols in terms of throughput, less end-to-end delay, as well as less packets drop. The DSR performance was attributed to its characteristics of having multiple routes to other destination. In case of link failure, it does not require a new route discovery processes. Because of this, end-to-end delay is reduced as well as less packet dropping. Hence, the DSR protocol was chosen as genial candidate for carrying out further research